abjure          promise or swear to give up

　　abraded         rubbed off， worn away by friction

　　abrasion        rubbing， scraping， wearing off

　　abrogate        repeal or annul by authority

　　abundant        plentiful

　　abut            border on

　　abysmal         bottomless， extreme

　　acclaimed       welcomed with shouts and approval

　　accolade        praise， approval

　　accretion       the growing of separate things into one

　　acquisition     smth acquired， acquiring

　　adhere          remain faithful， stick fast to

　　adhesion        adhering， support

　　adjacent        lying near， next

　　admonitory      containing warning

　　adulteration    making unpure， poorer in quality

　　agile           active， quick-moving

　　ail             trouble； be ill

　　alacrity        eager and cheerful readiness

　　allegiance      duty， support， loyalty

　　amalgamate      mix， combine， unite societies

　　amendment       improving

　　amplify         make large or fuller， increase the strength

　　annul           put an end to

　　antidote        medicine used against a poison or a disease

　　apprehensive    grasping， understanding； fear， unhappy feeling about future

　　apt             well-suited， quick-witted

　　arboreal        of connected with trees

　　ardently        with full of ardour

　　ardour          enthusiasm

　　articulate      speak distinctly， connect by joints

　　ascend          go or come up

　　ascent          the act of ascending

　　ascertain       get to know

　　asset           valuable quality， smth that has money value

　　assuage         make smth （pain， desire） less